Streak-camera measurements of the PEP-II High-Energy Ring

Conference · Fri May 01 00:00:00 EDT 1998

DOI:https://doi.org/10.1063/1.57033· OSTI ID:666110

Fisher, A S; Assmann, R W ^[1]; Lumpkin, A H ^[2]; Zotter, B ^[3]; Byrd, J; Hinkson, J ^[4]

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1. Stanford Univ., CA (US). Stanford Linear Accelerator Center
2. Argonne National Lab., IL (US). Advanced Photon Source
3. CERN, Geneva (Switzerland)
4. Lawrence Berkeley National Lab., CA (US). Advanced Light Source

The third commissioning run of the PEP-II High-Energy Ring (HER, the 9-GeV electron ring), in January 1998, included extensive measurements of single-bunch and multibunch fills using LBNL's dual-axis streak camera combined with Argonne's 119.0-MHz synchroscan plug-in. For single bunches, the dependence of bunch length on charge and RF voltage was studied from 0.5 to 2.5 mA and from 9.5 to 15 MV; the measured values ranged from 38 to 49 ps rms. The multibunch work focused on longitudinal instabilities as the current in the ring was raised to 500 mA, and the length of the bunch train was varied from 100 bunches (with 4.2-ns spacing) to a full ring. Large oscillations of up to 180 ps peak to peak were observed for bunches half a ring turn away from the start of the train, especially at higher currents and for trains filling roughly half the ring. These observations led to a new fill pattern with more gaps that allowed the authors to raise the current to 750 mA by the end of the run.

• Research Organization: Stanford Univ., Stanford Linear Accelerator Center, CA (US); Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
• Sponsoring Organization: USDOE Office of Energy Research, Washington, DC (US)
• DOE Contract Number: AC03-76SF00515; AC03-76SF00098
• OSTI ID: 666110
• Report Number(s): SLAC-PUB-7836; CONF-980573-; ON: DE98059230; TRN: US200305%%1134
• Resource Relation: Conference: 8. beam instrumentation workshop (BIW-98), Stanford, CA (US), 05/04/1998--05/07/1998; Other Information: Supercedes report DE98059230; PBD: May 1998; PBD: 1 May 1998
• Country of Publication: United States
• Language: English

Related Subjects

43 PARTICLE ACCELERATORS
COMMISSIONING
DATA
ELECTRONS
OSCILLATIONS
STREAK CAMERAS